I would also really like this feature, I use it a lot when coding, i.e.:
Without releasing the left button:
- Scroll to piece of code I want to eye-ball
- Mouse-away to snap back to my original view
- Mouse-back-in-range to eye-ball other code again
- Release left button to stick to whichever view I want in the end.
I'm so used to this that I constantly lose my current scroll position, scrolling away not thinking I can't get back... my work around is usually ctrl-Z, ctrl-Y (as I usually just changed code at the first position, but that's ugly) (although I'm glad to hear about the "escape to cancel scroll" feature mentioned by jburnett below). It's the behavior of every native toolbar on Windows and I believe there should at least be an option to have the Sublime Text toolbar behave this way as well for a more uniform UX on Windows.
I just started to use Sublime Text and I LOVE it, but this is missing.